Relay mounting



March 30, 1937. w. w. WILLIAMS RELAY MOUNTING Filed April 11, 1934 INVENTOR. 14 141. TEA W. W/LL/fl/VJ ATTORNEY.

UNITED STATES PATENT OFFICE numv MOUNTING Walter W. Williams, Bloomington, Ill.

m lication April 11, 1934, Serial No. 120,003

lClalm.

This invention relates to improvements in the mounting of relays upon instrument panels and more particularly to the mounting for a 60 cycle alternating current relay.

Relays operated by a 60 cycle alternating current produce a hum, as it is referred to in the trade. This hum is produced by the vibration set up in the metallic parts of the relay, occasioned by the constantly changing fields produced by the alternating current, and when a relay of this operativeness.

type is mounted upon a panel board, the vibrations are transmitted to other instruments mounted on the same board which, in case of a delicate instrument, is likely to interfere-with its When panel boards are mounted in a metallic box and the box mounted upon the frame or housing of an electrically operated and controlled oil burner, the vibration or hum' is transmitted from the-relay through the panel board and metal box to the housing of the oil burner so that all of these parts are placed under vibration. It has been found that if a control box of metal containing a panel board mounting a relay ofthis type be secured to the walls of a dwelling, the vibration or hum is transmitted through the entire house.

It is an object of this invention to so mount a relay of this type upon a-panel board that the vibrations will be absorbed in the connection of the mounting upon the board and the above objectionable feature is removed.

With this and other objects in view, reference is made to the accompanying sheet of drawings which illustrates a preferred embodiment of this invention with the understanding that minor changes may be made without departing from the scope thereof.

In the drawing:

Figure 1 is a'view in front elevation of a panel board illustrating the improved mounting of the relay, also a transformer mounted thereon indicated in broken lines.

Figure 2 is a view in rear elevation of Figure 1.

Figure 3 is a view in section taken on the line 3-3, Figure 2.

Figure 4 is a projected view in perspective of the vibration absorbing means.

Figure 5 is a detail view in side elevation of the relay panel and relay mounted thereon.

Figure 1 illustrates a panel board I of insulating material such as is customarily used for mounting a relay 2, transformer 3, and such other electrical controls as may be desired for the control of electrically operated devices, such as electrically operated and controlled fluid fuelburning mechanisms, the blank recessed space 4 being provided for this purpose. In accordance with this invention, the relay 2 is mounted on an oblong panel 5 of insulating material which in turn is mounted in an aperture 6 provided in the panel I of the same general contour as the relay panel 5 with the edges of the panel 5 spaced apart from the edges of this aperture. The rear of the panel I is either offset at the top and bottom of the aperture 6 or is provided with offset supporting strips I and 8, as illustrated, for receiving the attaching means to support the front face of the relay panel 5 in a position flush with the front face or surface of the panel I. In order to absorb the constant and rapid vibrations transmitted to the relay panel 5 by the operation of a cycle alternating current relay, a bushing of caoutchouc 9, preferably pure gum, is provided at the top and bottom of the panel and is passed through apertures l0 provided therefor in the offsets I and 8. The bushing 9 is provided with an annular flange I l which extends between the adjacent surfaces of the panel 5 and the supporting strips 1 and 8 and is of sufflcient thickness to normally support the surfaces of the panels I and 5 flush with each other. The bushing is preferably secured by providing a central bore l2 therethrough for the reception of a threaded screw l3 preferably having its head I countersunk in the panel 5. A washer [5 of caoutchouc having a similar bore is placed about the screw l3 to enengage the rear end of the bushing 9 and rear side of the offset supports 1 and 8, which in turn is held in firm engagement with said supports in any desired manner, such as by a metallic washer l6 interposed between the caoutchouc washer I5 and metallic nuts l'l threaded upon the end of the screws l3 as shown. By placing the proper tension upon the screw and nuts, the screw being completely surrounded by the caoutchouc bushing and washer with the oifset support embraced by these parts, any vibration imparted to the panel 5 is absorbed by the caoutchouc and is not transmitted to the oifset support or panel I. In the particular type of relay employed it has been found most convenient to support the panel 5 by two'connections at the top adjacent each corner and one central connection at the bottom. As many of these vibration absorbing connections as desired may be employed in themounting of the relay panel.

What I claim is:

The combination with an instrument panel for a vibration-imparting instrument having an aperture therein provided with supporting Offsets thereabout, andan instrument, carrying panel mounting said vibration-imparting instrument upon the exterior thereof received within said aperture and spaced apart from the walls thereof, of means acUacent the edges of the second panel on the side opposite said instrument to center I said panel and to engage the supporting portion of the first panel, including bushings of vibra- 1 tion-absorbing material received within apertures therefor in said supporting portions having annular flanges about one end of said bushings interposed between said panels with screws passing through the front face of the second panel having securing nuts threaded thereupon at the rear v 

